X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=libatalk%2Fdsi%2Fdsi_stream.c;h=5943337d434b5e9c3ab8a8381e647aa3eef36444;hb=465246e257d9aff9855e3e35d8fd5983db932b45;hp=5cd34a5815f67b5b8f654c41a754ed777a84f87e;hpb=ef25b4acfc5daa2f0ee7f1e17ee2d7d1a7f0d159;p=netatalk.git

diff --git a/libatalk/dsi/dsi_stream.c b/libatalk/dsi/dsi_stream.c
index 5cd34a58..5943337d 100644
--- a/libatalk/dsi/dsi_stream.c
+++ b/libatalk/dsi/dsi_stream.c
@@ -122,6 +122,135 @@ static int dsi_peek(DSI *dsi)
     return 0;
 }
 
+/* 
+ * Return all bytes up to count from dsi->buffer if there are any buffered there
+ */
+static size_t from_buf(DSI *dsi, u_int8_t *buf, size_t count)
+{
+    size_t nbe = 0;
+
+    if (dsi->buffer == NULL)
+        /* afpd master has no DSI buffering */
+        return 0;
+
+    LOG(log_maxdebug, logtype_dsi, "from_buf: %u bytes", count);
+    
+    nbe = dsi->eof - dsi->start;
+
+    if (nbe > 0) {
+        nbe = min((size_t)nbe, count);
+        memcpy(buf, dsi->start, nbe);
+        dsi->start += nbe;
+
+        if (dsi->eof == dsi->start)
+            dsi->start = dsi->eof = dsi->buffer;
+    }
+
+    LOG(log_debug, logtype_dsi, "from_buf(read: %u, unread:%u , space left: %u): returning %u",
+        dsi->start - dsi->buffer, dsi->eof - dsi->start, dsi->end - dsi->eof, nbe);
+
+    return nbe;
+}
+
+/*
+ * Get bytes from buffer dsi->buffer or read from socket
+ *
+ * 1. Check if there are bytes in the the dsi->buffer buffer.
+ * 2. Return bytes from (1) if yes.
+ *    Note: this may return fewer bytes then requested in count !!
+ * 3. If the buffer was empty, read from the socket.
+ */
+static ssize_t buf_read(DSI *dsi, u_int8_t *buf, size_t count)
+{
+    ssize_t len;
+
+    LOG(log_maxdebug, logtype_dsi, "buf_read(%u bytes)", count);
+
+    if (!count)
+        return 0;
+
+    len = from_buf(dsi, buf, count); /* 1. */
+    if (len)
+        return len;             /* 2. */
+  
+    len = readt(dsi->socket, buf, count, 0, 1); /* 3. */
+
+    LOG(log_maxdebug, logtype_dsi, "buf_read(%u bytes): got: %d", count, len);
+
+    return len;
+}
+
+/*
+ * Get "length" bytes from buffer and/or socket. In order to avoid frequent small reads
+ * this tries to read larger chunks (8192 bytes) into a buffer.
+ */
+static size_t dsi_buffered_stream_read(DSI *dsi, u_int8_t *data, const size_t length)
+{
+  size_t len;
+  size_t buflen;
+
+  LOG(log_maxdebug, logtype_dsi, "dsi_buffered_stream_read: %u bytes", length);
+  
+  len = from_buf(dsi, data, length); /* read from buffer dsi->buffer */
+  dsi->read_count += len;
+  if (len == length) {          /* got enough bytes from there ? */
+      return len;               /* yes */
+  }
+
+  /* fill the buffer with 8192 bytes or until buffer is full */
+  buflen = min(8192, dsi->end - dsi->eof);
+  if (buflen > 0) {
+      ssize_t ret;
+      ret = read(dsi->socket, dsi->eof, buflen);
+      if (ret > 0)
+          dsi->eof += ret;
+  }
+
+  /* now get the remaining data */
+  if ((buflen = dsi_stream_read(dsi, data + len, length - len)) != length - len)
+      return 0;
+  len += buflen;
+
+  return len;
+}
+
+/* ---------------------------------------
+*/
+static void block_sig(DSI *dsi)
+{
+  dsi->in_write++;
+}
+
+/* ---------------------------------------
+*/
+static void unblock_sig(DSI *dsi)
+{
+  dsi->in_write--;
+}
+
+/*********************************************************************************
+ * Public functions
+ *********************************************************************************/
+
+/*!
+ * Communication error with the client, enter disconnected state
+ *
+ * 1. close the socket
+ * 2. set the DSI_DISCONNECTED flag
+ *
+ * @returns  0 if successfully entered disconnected state
+ *          -1 if ppid is 1 which means afpd master died
+ *             or euid == 0 ie where still running as root (unauthenticated session)
+ */
+int dsi_disconnect(DSI *dsi)
+{
+    dsi->proto_close(dsi);          /* 1 */
+    dsi->flags |= DSI_DISCONNECTED; /* 2 */
+    if (geteuid() == 0)
+        return -1;
+    return 0;
+}
+
 /* ------------------------------
  * write raw data. return actual bytes read. checks against EINTR
  * aren't necessary if all of the signals have SA_RESTART
@@ -137,6 +266,9 @@ ssize_t dsi_stream_write(DSI *dsi, void *data, const size_t length, int mode)
 
   LOG(log_maxdebug, logtype_dsi, "dsi_stream_write: sending %u bytes", length);
 
+  if (dsi->flags & DSI_DISCONNECTED)
+      return -1;
+
   while (written < length) {
       len = send(dsi->socket, (u_int8_t *) data + written, length - written, flags);
       if (len >= 0) {
@@ -188,6 +320,9 @@ ssize_t dsi_stream_read_file(DSI *dsi, int fromfd, off_t offset, const size_t le
 
   LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file: sending %u bytes", length);
 
+  if (dsi->flags & DSI_DISCONNECTED)
+      return -1;
+
   dsi->in_write++;
   written = 0;
 
@@ -227,80 +362,28 @@ ssize_t dsi_stream_read_file(DSI *dsi, int fromfd, off_t offset, const size_t le
 }
 #endif
 
-/* 
- * Return all bytes up to count from dsi->buffer if there are any buffered there
- */
-static size_t from_buf(DSI *dsi, u_int8_t *buf, size_t count)
-{
-    size_t nbe = 0;
-
-    if (dsi->buffer == NULL)
-        /* afpd master has no DSI buffering */
-        return 0;
-
-    LOG(log_maxdebug, logtype_dsi, "from_buf: %u bytes", count);
-    
-    nbe = dsi->eof - dsi->start;
-
-    if (nbe > 0) {
-        nbe = min((size_t)nbe, count);
-        memcpy(buf, dsi->start, nbe);
-        dsi->start += nbe;
-
-        if (dsi->eof == dsi->start)
-            dsi->start = dsi->eof = dsi->buffer;
-    }
-
-    LOG(log_debug, logtype_dsi, "from_buf(read: %u, unread:%u , space left: %u): returning %u",
-        dsi->start - dsi->buffer, dsi->eof - dsi->start, dsi->end - dsi->eof, nbe);
-
-    return nbe;
-}
-
-/*
- * Get bytes from buffer dsi->buffer or read from socket
- *
- * 1. Check if there are bytes in the the dsi->buffer buffer.
- * 2. Return bytes from (1) if yes.
- *    Note: this may return fewer bytes then requested in count !!
- * 3. If the buffer was empty, read from the socket.
- */
-static ssize_t buf_read(DSI *dsi, u_int8_t *buf, size_t count)
-{
-    ssize_t len;
-
-    LOG(log_maxdebug, logtype_dsi, "buf_read(%u bytes)", count);
-
-    if (!count)
-        return 0;
-
-    len = from_buf(dsi, buf, count); /* 1. */
-    if (len)
-        return len;             /* 2. */
-  
-    len = readt(dsi->socket, buf, count, 0, 1); /* 3. */
-
-    LOG(log_maxdebug, logtype_dsi, "buf_read(%u bytes): got: %d", count, len);
-
-    return len;
-}
 
 /*
  * Essentially a loop around buf_read() to ensure "length" bytes are read
  * from dsi->buffer and/or the socket.
+ *
+ * @returns length on success, some value smaller then length indicates an error
  */
 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
 {
   size_t stored;
   ssize_t len;
 
+  if (dsi->flags & DSI_DISCONNECTED)
+      return 0;
+
   LOG(log_maxdebug, logtype_dsi, "dsi_stream_read(%u bytes)", length);
 
   stored = 0;
   while (stored < length) {
       len = buf_read(dsi, (u_int8_t *) data + stored, length - stored);
       if (len == -1 && (errno == EINTR || errno == EAGAIN)) {
-          LOG(log_debug, logtype_dsi, "dsi_stream_read: select read loop");
+          LOG(log_maxdebug, logtype_dsi, "dsi_stream_read: select read loop");
           continue;
       } else if (len > 0) {
           stored += len;
@@ -310,8 +393,8 @@ size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
               if (! (dsi->flags & DSI_DISCONNECTED)) {
                   LOG(log_error, logtype_dsi, "dsi_stream_read: len:%d, %s",
                       len, (len < 0) ? strerror(errno) : "unexpected EOF");
-                  AFP_PANIC("FIXME");
               }
+              return 0;
           }
           break;
       }
@@ -323,51 +406,6 @@ size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
   return stored;
 }
 
-/*
- * Get "length" bytes from buffer and/or socket. In order to avoid frequent small reads
- * this tries to read larger chunks (8192 bytes) into a buffer.
- */
-static size_t dsi_buffered_stream_read(DSI *dsi, u_int8_t *data, const size_t length)
-{
-  size_t len;
-  size_t buflen;
-
-  LOG(log_maxdebug, logtype_dsi, "dsi_buffered_stream_read: %u bytes", length);
-  
-  len = from_buf(dsi, data, length); /* read from buffer dsi->buffer */
-  dsi->read_count += len;
-  if (len == length) {          /* got enough bytes from there ? */
-      return len;               /* yes */
-  }
-
-  /* fill the buffer with 8192 bytes or until buffer is full */
-  buflen = min(8192, dsi->end - dsi->eof);
-  if (buflen > 0) {
-      ssize_t ret;
-      ret = read(dsi->socket, dsi->eof, buflen);
-      if (ret > 0)
-          dsi->eof += ret;
-  }
-
-  /* now get the remaining data */
-  len += dsi_stream_read(dsi, data + len, length - len);
-  return len;
-}
-
-/* ---------------------------------------
-*/
-static void block_sig(DSI *dsi)
-{
-  dsi->in_write++;
-}
-
-/* ---------------------------------------
-*/
-static void unblock_sig(DSI *dsi)
-{
-  dsi->in_write--;
-}
-
 /* ---------------------------------------
  * write data. 0 on failure. this assumes that dsi_len will never
  * cause an overflow in the data buffer. 
@@ -382,6 +420,9 @@ int dsi_stream_send(DSI *dsi, void *buf, size_t length)
   LOG(log_maxdebug, logtype_dsi, "dsi_stream_send: %u bytes",
       length ? length : sizeof(block));
 
+  if (dsi->flags & DSI_DISCONNECTED)
+      return 0;
+
   block[0] = dsi->header.dsi_flags;
   block[1] = dsi->header.dsi_command;
   memcpy(block + 2, &dsi->header.dsi_requestID, 
@@ -452,6 +493,9 @@ int dsi_stream_receive(DSI *dsi, void *buf, const size_t ilength,
 
   LOG(log_maxdebug, logtype_dsi, "dsi_stream_receive: %u bytes", ilength);
 
+  if (dsi->flags & DSI_DISCONNECTED)
+      return 0;
+
   /* read in the header */
   if (dsi_buffered_stream_read(dsi, (u_int8_t *)block, sizeof(block)) != sizeof(block)) 
     return 0;